I am a prime number.
The double of myself is equal to the square of me.

which number am I?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Can you identify the hidden rebus in the image below?

What is the next number in the series?

15 29 56 108 208 ?

Can you find the 09 errors in the picture below?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

How far can you walk into the woods?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

Prove that twice of ten is the same as twice of eleven.